1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17//#define LOG_NDEBUG 0
18#define LOG_TAG "GraphicBufferListener"
19
20#include <media/stagefright/foundation/ADebug.h>
21#include <media/stagefright/foundation/AMessage.h>
22#include <media/stagefright/MediaErrors.h>
23
24#include <gui/BufferItem.h>
25#include <utils/String8.h>
26
27#include "GraphicBufferListener.h"
28
29namespace android {
30
31status_t GraphicBufferListener::init(
32        const sp<AMessage> &notify,
33        size_t bufferWidth, size_t bufferHeight, size_t bufferCount) {
34    mNotify = notify;
35
36    String8 name("GraphicBufferListener");
37    BufferQueue::createBufferQueue(&mProducer, &mConsumer);
38    mConsumer->setConsumerName(name);
39    mConsumer->setDefaultBufferSize(bufferWidth, bufferHeight);
40    mConsumer->setConsumerUsageBits(GRALLOC_USAGE_SW_READ_OFTEN);
41
42    status_t err = mConsumer->setMaxAcquiredBufferCount(bufferCount);
43    if (err != NO_ERROR) {
44        ALOGE("Unable to set BQ max acquired buffer count to %zu: %d",
45                bufferCount, err);
46        return err;
47    }
48
49    wp<BufferQueue::ConsumerListener> listener =
50        static_cast<BufferQueue::ConsumerListener*>(this);
51    sp<BufferQueue::ProxyConsumerListener> proxy =
52        new BufferQueue::ProxyConsumerListener(listener);
53
54    err = mConsumer->consumerConnect(proxy, false);
55    if (err != NO_ERROR) {
56        ALOGE("Error connecting to BufferQueue: %s (%d)",
57                strerror(-err), err);
58        return err;
59    }
60
61    ALOGV("init() successful.");
62
63    return OK;
64}
65
66void GraphicBufferListener::onFrameAvailable(const BufferItem& /* item */) {
67    ALOGV("onFrameAvailable() called");
68
69    {
70        Mutex::Autolock autoLock(mMutex);
71        mNumFramesAvailable++;
72    }
73
74    sp<AMessage> notify = mNotify->dup();
75    mNotify->setWhat(kWhatFrameAvailable);
76    mNotify->post();
77}
78
79void GraphicBufferListener::onBuffersReleased() {
80    ALOGV("onBuffersReleased() called");
81    // nothing to do
82}
83
84void GraphicBufferListener::onSidebandStreamChanged() {
85    ALOGW("GraphicBufferListener cannot consume sideband streams.");
86    // nothing to do
87}
88
89BufferItem GraphicBufferListener::getBufferItem() {
90    BufferItem item;
91
92    {
93        Mutex::Autolock autoLock(mMutex);
94        if (mNumFramesAvailable <= 0) {
95            ALOGE("getBuffer() called with no frames available");
96            return item;
97        }
98        mNumFramesAvailable--;
99    }
100
101    status_t err = mConsumer->acquireBuffer(&item, 0);
102    if (err == BufferQueue::NO_BUFFER_AVAILABLE) {
103        // shouldn't happen, since we track num frames available
104        ALOGE("frame was not available");
105        item.mSlot = -1;
106        return item;
107    } else if (err != OK) {
108        ALOGE("acquireBuffer returned err=%d", err);
109        item.mSlot = -1;
110        return item;
111    }
112
113    // Wait for it to become available.
114    err = item.mFence->waitForever("GraphicBufferListener::getBufferItem");
115    if (err != OK) {
116        ALOGW("failed to wait for buffer fence: %d", err);
117        // keep going
118    }
119
120    // If this is the first time we're seeing this buffer, add it to our
121    // slot table.
122    if (item.mGraphicBuffer != NULL) {
123        ALOGV("setting mBufferSlot %d", item.mSlot);
124        mBufferSlot[item.mSlot] = item.mGraphicBuffer;
125    }
126
127    return item;
128}
129
130sp<GraphicBuffer> GraphicBufferListener::getBuffer(BufferItem item) {
131    sp<GraphicBuffer> buf;
132    if (item.mSlot < 0 || item.mSlot >= BufferQueue::NUM_BUFFER_SLOTS) {
133        ALOGE("getBuffer() received invalid BufferItem: mSlot==%d", item.mSlot);
134        return buf;
135    }
136
137    buf = mBufferSlot[item.mSlot];
138    CHECK(buf.get() != NULL);
139
140    return buf;
141}
142
143status_t GraphicBufferListener::releaseBuffer(BufferItem item) {
144    if (item.mSlot < 0 || item.mSlot >= BufferQueue::NUM_BUFFER_SLOTS) {
145        ALOGE("getBuffer() received invalid BufferItem: mSlot==%d", item.mSlot);
146        return ERROR_OUT_OF_RANGE;
147    }
148
149    mConsumer->releaseBuffer(item.mSlot, item.mFrameNumber,
150            EGL_NO_DISPLAY, EGL_NO_SYNC_KHR, Fence::NO_FENCE);
151
152    return OK;
153}
154
155}   // namespace android
156